NAME

SYNOPSIS

FLAGS

Changes the specified characteristics for interface_name.
You must provide an interface name.
Enables (1) or disables (0) IEEE 802.3u autonegotiation.
This option applies only to those devices that are capable of
autonegotiation (for example, DE500-AA and DE500-BA).
When enabled,
the interface automatically negotiates the link speed (10 or 100 Mb/s)
and the mode (half-duplex or full-duplex) with the remote interface.

The interface initially advertises the speed and mode previously selected at
the console level or with the -s and -x
options. The -s and -x options may also be specified on
the same command line as the -a option to redefine and renegotiate
the interface's capability (when enabled) or to force the interface at a
certain configuration (when disabled).

Note

The interface initiates the autonegotiation process only if and
when it is up and running. See ifconfig(8) for information on how
the interface is marked up.

Changes the type of medium. The following table lists the supported types:

Type

Meaning

aui

10Base5, or thick wire

bnc

10Base2, or ThinWire

utp

10BaseT (if speed is 10 Mb/s) or

100BaseT (if speed is 100 Mb/s), or

twisted-pair

fiber

100BaseFX only

On some devices, for example, DE435 and DE425, bnc
selection is done by means of an on-board gang jumper. When specifying
aui or bnc for these devices, be sure that the jumper is in
the correct position.
Changes the medium speed, if the interface is capable of operating at
both regular (10 Mb/s) and fast (100 Mb/s) Ethernet speeds. The
fast speed cannot be selected for the aui and bnc media.
Enables (1) or disables (0) full-duplex operation when the
utp medium is specified.

DESCRIPTION

The lan_config command allows you to modify the type of medium,
speed, and mode of operation (half- or full-duplex).

You can also use the lan_config command to enable or disable
autonegotiation, if the underlying device has this capability.
Autonegotiation is a hardware and software (driver) process that allows
determination of the highest common speed and duplex (half or full)
configuration. The
permitted combinations of speed and mode of operation in descending
order of precedence, from the highest to the lowest, are:

Speed

Mode

100 Mb/s

full-duplex

100 Mb/s

half-duplex

10 Mb/s

full-duplex

10 Mb/s

half-duplex

During autonegotiation, for example, if the local interface advertises that it
is capable of 100 Mb/s half-duplex operation, it is by implication also capable of 10 Mb/s, full-duplex and 10 Mb/s, half-duplex operation. If the remote
interface advertises that it is capable of 10 Mb/s, full-duplex operation
only, the link is established at 10 Mb/s, full-duplex. The autonegotiation
process can take several seconds to complete.

The characteristics managed with the lan_config
command are ordinarily set from the console level via the
EWx0_MODE environment variable. The lan_config
command allows you to override this default and configure the
interface as needed after the system is up and running.

Modifications made with the lan_config
command do not persist across reboots of the operating system.

You can also use the ifconfig command to set the speed and mode
(half- or full-duplex) either from the command line or in the
/etc/rc.local file. If you specify the command in the rc.local
file, the command is executed each time the system is booted; you do not
have to modify the SRM console environment variables.

RESTRICTIONS

Support for the lan_config command is limited to the tu
interface for this release of Tru64 UNIX.